We have accounts of the reappearance of the plague on the continent of Europe, which, if they do not create actual alarm, are at any rate calculated to excite a strong interest about it, more especially as regards the precautionary and other measures which were adopted in this country on the occasion of its former visitations. To some of the official documents recording these proceedings I have been allowed to have access, and I propose now to lay before you a few extracts from them.